CN112973965B - Electric precipitation outlet smoke dust concentration closed-loop control method realized in DCS - Google Patents

Electric precipitation outlet smoke dust concentration closed-loop control method realized in DCS Download PDF

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CN112973965B
CN112973965B CN202110169062.5A CN202110169062A CN112973965B CN 112973965 B CN112973965 B CN 112973965B CN 202110169062 A CN202110169062 A CN 202110169062A CN 112973965 B CN112973965 B CN 112973965B
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dcs
frequency power
outlet
concentration
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CN112973965A (en
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孙岩
林闽城
海浩
孙海渔
雍鹏
陈昊
谢松
潘颖娣
卢世毅
李莎
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Ningxia Zaoquan Power Generation Co ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/34—Constructional details or accessories or operation thereof
    • B03C3/66—Applications of electricity supply techniques
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/34—Constructional details or accessories or operation thereof
    • B03C3/66—Applications of electricity supply techniques
    • B03C3/68—Control systems therefor
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
    • Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]

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Abstract

The invention relates to a closed-loop control method for the concentration of smoke dust at an electric precipitation outlet, which is realized in a DCS (distributed control system). The parameter setting and control logic of an electric precipitation high-frequency power supply in the DCS are kept unchanged, and the automatic control logic of the concentration of the smoke dust at the electric precipitation outlets on an A side and a B side is increased; the upper computer of the high-frequency power supply of the electric dust collector and the host DCS establish communication through an MODBUS protocol, and load signals and smoke concentration signals in the DCS are directly collected; the side A and the side B are respectively configured with automatic control logics for the dust concentration at the electric precipitation outlet, and the controlled objects are the dust concentration at the electric precipitation outlet at the side A and the side B; the set value and the measured value of the dust concentration at the outlet of the electric precipitation are calculated by a PID algorithm block, and then secondary current total commands are output, and the total commands are linearly processed and then sent to high-frequency power supplies of all electric fields. The beneficial effects of the invention are: the electric dust removal high-frequency power supply monitoring system is brought into the DCS of the unit, and operators set parameters such as secondary voltage and secondary current in the DCS to realize the monitoring of the high-frequency power supply.

Description

Electric precipitation outlet smoke dust concentration closed-loop control method realized in DCS
Technical Field
The invention relates to a closed-loop control method, in particular to a closed-loop control method for smoke concentration at an outlet of electric precipitation realized in DCS.
Background
China is a large country for producing and applying electric dust collectors, and the most widely applied high-efficiency dust collector in the industrial field is the electric dust collector at present. Electric dust collectors have been used for decades in the electric power industry in China. From the 20 th century and 80 s to the present, the high-voltage power supply used by electric dust collectors in the field of environmental protection basically adopts a thyristor power frequency phase control power supply with two-phase input, so that huge electric energy is consumed. With the continuous maturity of high-frequency power supply technology, the high-frequency power supply has the characteristics of small volume, light weight, convenience in installation, high electric energy conversion efficiency, three-phase balanced power supply and the like, and is more and more widely applied to electric dust collectors.
The high-frequency power supply is a power supply device of the electric dust collector, the high-frequency power supply of the electric dust collector is an inverter type power supply formed by utilizing a high-frequency switching technology, the power supply current of the high-frequency power supply is formed by a series of narrow pulses, and various voltage waveforms from nearly pure direct current to large pulse amplitude can be provided for the electric dust collector. The control mode of the high-frequency power supply is flexible and various, the most appropriate voltage waveform can be selected according to the operation condition of the electric dust remover, the energy consumption of the electric dust remover is reduced, and the dust removing efficiency is improved. After the high-frequency rectification power supply is applied, secondary voltage ripples are very little, and steady direct current basically, and the electric field internal pole is difficult for discharging in the during operation, can promote operating voltage, electric current by a wide margin to improve dust collection efficiency.
The main operation control modes of the existing high-frequency power supply are as follows:
(1) Sparking rate setting control mode
The dust collector is suitable for occasions with high dust concentration, easy corona blocking and low dust collection efficiency, and can strengthen the charge of dust and improve the dust collection efficiency. However, this control method consumes a large amount of electric power.
(2) Pulse and intermittent power supply control mode
When the method is operated, the device is operated according to parameters set by pulse width, pulse period, high-energy frequency and low-energy frequency, is limited by rated secondary voltage and rated secondary current, and is controlled by flash frequency during flashover.
(3) Manual fixed frequency
When the method is operated, the operation is carried out according to a manual frequency set value and is limited by rated secondary voltage and rated secondary current, and during flashover, the operation is controlled by flashover frequency.
(4) Upper computer monitoring system
The monitoring of the operation parameters, the alarm state, the fault information and the communication state of the high-frequency power supply of each electric dust remover is realized through Ethernet communication, and the normal operation of the whole electric dust removal control system is ensured. And the operator sets parameters such as secondary voltage, secondary current and the like in the upper computer to realize monitoring on the high-frequency power supply.
The control of the high-frequency power supply of the existing electric dust collector consists of an upper computer monitoring system and the high-frequency power supply, and the upper computer monitoring system is utilized to realize man-machine communication between an electric dust collector management system and an operator so as to complete parameter setting; data exchange among the high-frequency power supply setting parameters, the operation data and the PLC control program is realized; and communication of communication data of the PLC and the high-frequency power supply is realized, and open-loop control on the set value of the limiting current of the high-frequency power supply is completed. A small number of power plants are optimized in the later period, a PID closed-loop control system is added in a PLC of a high-frequency power supply, a current-voltage double-value priority control system is used as an inner ring, a PID closed-loop control system is added on the periphery of the inner ring and used as an outer ring, and the whole control system is mainly based on the inner ring and assisted by the outer ring. The outer ring is composed of a high-voltage monitoring system and a body low-voltage PLC control system, the PLC is internally programmed by adopting a structured text, and the regulation of the secondary voltage and the secondary current of the high-frequency power supply is realized by adopting a PID algorithm. The control schematic is shown in fig. 1.
According to the change of the internal working condition of the electric field and the secondary voltage, the secondary current value is always close to the current limit set value, the current limit value tracks the dynamic change of the electric field by increasing or reducing, so that the electric field runs in a state of less sparks, and the best energy-saving state is achieved on the premise of ensuring the dust collection effect of the electric field.
Two 660MW ultra-supercritical units exist in Ningxia jujube spring power generation Limited company, each unit is provided with two electric dust collectors with double chambers and five electric fields, a smoke concentration instrument is installed at a flue at an outlet of each electric field, and an electric dust collector body is designed and manufactured by Zhejiang Feida environmental protection Limited company. The high-frequency power supply device for electric dust removal is produced by Zhejiang Jiahuan electronics limited company, adopts a JHGP type control system in a matching way, and has an output direct current embossing patternSmall wave, high electric energy conversion efficiency, three-phase balance power supply and the like. When the unit is in operation, the smoke emission concentration meets the emission requirement of the new environmental protection standard, and the smoke emission concentration is reduced to less than 5mg/Nm 3 Near zero emission, because the original control system can not dynamically track and adjust the high-frequency power supply, the parameters of the high-frequency power supply can only be manually set by an operator, and the discharge concentration of the smoke dust at the outlet of the electric dust collector is maintained at 15mg/Nm for a long time 3 In the following operation, the problem that the emission concentration of the smoke dust exceeds the standard sometimes occurs when the adjustment is not in time.
The following problems exist in the prior art:
(1) High power consumption rate
After the unit is put into operation, the output adjustment of the electric dust removal high-frequency power supply always adopts a method of manually setting parameters by operators, the operators often set the operation parameters of the high-frequency power supply to be very high in order to reduce the operation frequency, and the discharge concentration of smoke dust at the outlet of the electric dust remover is maintained at 15mg/Nm for a long time 3 The following operation increases the power consumption rate of the electric dust collector.
(2) The problem of excessive smoke dust emission concentration
The control mode of the high-frequency power supply is a manual operation mode, and the control mode cannot adapt to load and coal quality change, and the problems that operating personnel cannot control the operating parameters of the high-frequency power supply in time when the load is changed frequently and the emission concentration of smoke dust cannot reach the emission standard in a short time are solved.
(3) The problem of high operating strength of operators
The manual operation mode of the high-frequency power supply can not adapt to load and coal quality change, the given limit current can be adjusted at regular time by operators, the operation is repeated for a long time every day, the labor intensity is high, and the adjustment quality is difficult to ensure. Therefore, in view of the fact that the original control system cannot dynamically perform automatic feedback adjustment on the secondary current value, it is necessary to design a set of secondary current closed-loop control system of the high-frequency power supply on the basis of the existing equipment.
With the increasingly severe operating forms of thermal power generating units and the more serious environmental assessment, how to reduce the power consumption of electric dust removal as far as possible on the premise of ensuring that the smoke emission reaches the standard is a new subject in the front, so that it is very necessary to optimize a control system on the basis of the existing equipment.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a closed-loop control method for the dust concentration at an electric precipitation outlet in a DCS.
The closed-loop control method for the dust concentration at the outlet of the electric dust remover, which is realized in DCS, comprises the following steps:
keeping the parameter setting and control logic of an electric precipitation high-frequency power supply in the DCS unchanged, and increasing the automatic control logic of the dust concentration of the electric precipitation outlets of the A side and the B side;
the upper computer of the high-frequency power supply of the electric dust collector and the host DCS establish communication through an MODBUS protocol, and load signals and smoke concentration signals in the DCS are directly collected;
the side A and the side B are respectively configured with automatic control logics for the dust concentration at the electric precipitation outlet, and the controlled objects are the dust concentration at the electric precipitation outlet at the side A and the side B; the set value and the measured value of the dust concentration at the outlet of the electric precipitation are calculated by a PID algorithm block, and then secondary current total commands are output, and the total commands are linearly processed and then sent to high-frequency power supplies of all electric fields.
Preferably, the method comprises the following steps: and adding feedforward of the change of the load instruction of the unit to the automatic regulation and calculation of the secondary current, and correcting the secondary current instruction output parameter of the closed loop in real time according to the current load instruction.
Preferably, the method comprises the following steps: and (4) carrying out smoke concentration sudden-rise logic judgment before PID input, and when sudden-rise to the maximum value occurs, keeping the smoke concentration value before sudden-rise by the regulated quantity.
Preferably, the method comprises the following steps: the secondary current instruction of the automatic control loop and the original manual secondary current input instruction are switched after being subjected to rate limitation, and after a certain electric field high-frequency power supply is put into automatic control, the PID instruction is received and output; when the high-frequency power supply of the electric field is not put into automatic control, the secondary current is manually set through the original operation panel.
Preferably, the method comprises the following steps: the secondary current of an electric field on the A side and the B side is automatically controlled to be 200-500 mA at the upper and lower limit values; the upper and lower limit values of the secondary current of the two-electric field to the five-electric field on the A side and the B side are automatically controlled to be 300-1500 mA, and the secondary current of the two-electric field to the five-electric field is set in a mode of gradually increasing.
Preferably, the method comprises the following steps: the unit load instruction to control loop feedforward quantity is set according to the relation between the high-frequency power supply operation parameter and the smoke emission concentration under the working conditions of 50%,60%,70%,80%,90% and 100% of the load of the unit.
Preferably, the method comprises the following steps: and a judgment logic for keeping a good value after the short-time bad quality of the regulated signal, load change feedforward and manual automatic undisturbed switching are added into the PID closed-loop control logic.
Preferably, the method comprises the following steps: the method comprises the steps of respectively adding automatic control input and removal operation buttons of dust concentration of an A-side electric dust removal outlet and a B-side electric dust removal outlet in a DCS dry-type electric dust removal operation picture, and adding automatic input and offset setting operation panels of an A-side electric field to a five-electric field and an B-side electric field to a five-electric field.
The invention has the beneficial effects that:
1. the high-frequency power supply monitoring of the electric dust removal is brought into the DCS of the unit, and the operator sets parameters such as secondary voltage, secondary current and the like in the DCS to realize the monitoring of the high-frequency power supply.
2. The invention collects load signals, smoke concentration signals and the like in the DCS, directly uses the smoke concentration at the outlet of the electric dust collector in the DCS as an adjusting object, and realizes the configuration of closed-loop control logic.
3. The invention is based on the closed-loop control logic of the PID algorithm, and realizes the secondary current regulation of five electric fields of electric precipitation according to the ash collection amount of different electric fields of electric precipitation.
Drawings
FIG. 1 is a schematic diagram of closed-loop control of a high-frequency power supply;
FIG. 2 is a logic diagram of the control of secondary current of the A1 electric field high-frequency power supply of the electric precipitation A;
FIG. 3 is a schematic view of a DCS picture of the dry-type electric precipitation after a closed-loop control function is added;
FIG. 4 is a logic diagram of the control of the secondary current of the high-frequency power supply of the electric dust removal A electric field.
Detailed Description
The present invention will be further described with reference to the following examples. The following examples are set forth merely to aid in the understanding of the invention. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Example one
In order to solve the problems of energy conservation and environmental protection of a high-frequency power supply of an electric dust collector, closed-loop control is realized by adopting the smoke concentration at an outlet of the electric dust collector, so that the dust collection efficiency is improved to the maximum extent, and the energy consumption is saved. The closed-loop control of the high-frequency power supply of the electric dust collector can adjust the control parameters of the high-frequency power supply according to different operating conditions and the concentration of smoke dust at the outlet of the electric dust collector. Firstly, an upper computer of a high-frequency power supply of an electric dust collector (namely, an upper computer for controlling the high-frequency power supply of the electric dust collector) and a host DCS are required to establish communication through an MODBUS protocol, load signals, smoke concentration signals and the like in the DCS are directly collected, and the configuration of closed-loop control logic can be conveniently realized by utilizing the powerful configuration function and the friendly visual interface of the DCS. The basic idea is to keep the parameter setting and control logic of the electric precipitation high-frequency power supply in the existing DCS unchanged and increase the automatic control logic of the dust concentration of the electric precipitation outlets at the side A and the side B. The side A and the side B are respectively configured with automatic control logic for the dust concentration at the electric precipitation outlet, and the controlled objects are the dust concentrations at the electric precipitation outlet at the side A and the side B. The set value and the measured value of the dust concentration at the outlet of the electric precipitation are calculated by a PID algorithm block, and then secondary current total commands are output, and the total commands are linearly processed and then sent to high-frequency power supplies of all electric fields.
As a preferred embodiment, the level of the load directly affects the soot concentration, and the fluctuation range of the soot concentration is different under different loads. In order to enhance the adaptability of automatically adjusting the secondary current of the high-frequency power supply under the variable load working condition, feedforward of the change of the load instruction of the unit to the automatic adjustment calculation of the secondary current is added, and the secondary current instruction output parameter of the closed loop is corrected in real time according to the current load instruction, so that the more accurate closed-loop control of the smoke concentration is realized.
As a preferred embodiment, in the automatic control loop, in consideration of the problem of secondary dust emission when the five-electric-field cathode-anode rapping occurs, a smoke concentration sudden-rise logic judgment is made before PID input, and when a sudden-rise occurs to the maximum value, the regulated quantity keeps the smoke concentration value before the sudden-rise, so as to avoid the short-time secondary current sudden-rise and sudden-fall of each electric-field high-frequency power supply.
In a preferred embodiment, the secondary current command of the automatic control loop is switched with the original manual secondary current input command after rate limiting, and when a certain electric field high-frequency power supply is automatically controlled, the manual secondary current offset setting is performed by receiving the command output of the PID, and when the electric field high-frequency power supply is not automatically controlled, the manual secondary current setting is performed by the original operation panel. Taking the secondary current control logic of the electric precipitation A1 electric field high-frequency power supply as an example, the specific configuration is shown in FIG. 2. The electric precipitation divides AB both sides (be A electric precipitation and B electric precipitation respectively), there are two rooms of AB (the name is A electric precipitation A electric field respectively, A electric precipitation B electric field, B electric precipitation A electric field, B electric precipitation B electric field), every electric field is in the same direction as the flue flow direction and is had one again, two, three, four, five electric fields, 20 electric fields in total (the name is respectively [ A electric precipitation A1 electric field, A electric precipitation A2 electric field, A electric precipitation A3 electric field, A electric precipitation A4 electric field, A electric precipitation A5 electric field ], [ A electric precipitation B1 electric field, A electric precipitation B2 electric field, A electric precipitation B3 electric field, A electric precipitation B4 electric field, A electric precipitation B5 electric field, B electric precipitation B1 electric field, B3 electric field, B4 electric field, B5 electric field.
As a preferred embodiment, considering the dust conveying condition of the electric field and the capture action condition of the subsequent electric field on the secondary dust, the upper and lower limit values of the secondary current of the first electric field on the A side and the B side are automatically controlled to be 200-500mA, the upper and lower limit values of the secondary current of the second electric field to the five electric fields on the A side and the B side are automatically controlled to be 300-1500 mA, and the secondary current of the second electric field to the five electric fields is gradually increased. The unit load instruction to control loop feedforward quantity is set according to the relation between the high-frequency power supply operation parameter and the smoke emission concentration under the working conditions of 50%,60%,70%,80%,90% and 100% of the load of the unit.
As a preferred embodiment, optimization measures such as judgment logic for keeping good value after short-time bad quality of a regulated quantity (dust concentration at an electric precipitation outlet) signal, load change feedforward, manual automatic undisturbed switching and the like are added into the PID closed-loop control logic, so that the closed-loop control effect is more obvious. The logic for judging that the adjusted quantity signal keeps a good value after short-time bad quality is as follows: when the regulated quantity (the smoke concentration at the outlet of the electric precipitation) signal has bad quality in a short time, the regulated quantity (the smoke concentration at the outlet of the electric precipitation) signal is kept as a value before the signal is bad, and the problem that the PID closed-loop control automatically and frequently exits after the signal is bad in a short time is avoided.
Example two
The main function of the closed-loop control of the dust concentration at the outlet of the dry-type electric dust remover is to realize that the dust concentrations at the outlet of the electric dust remover on the A side and the B side and corresponding high-frequency power supply form a closed-loop adjusting system, and automatically adjust the set value of the output secondary current of the high-frequency power supply according to the deviation between the target value and the measured value of the dust concentration at the outlet of the electric dust remover, so that the dust concentration at the outlet of the electric dust remover is in a reasonable interval and the energy consumption of the high-frequency power supply is reduced. The specific embodiment in DCS is as follows:
(1) And (3) a picture part:
the DCS picture of the dry type electric precipitation after the closed-loop control function is added is shown in figure 3. Two automatic control input and cut-off operation buttons of dust concentration at the side A and the side B of the electric precipitation outlets are respectively added in the operation picture of the existing DCS dry-type electric precipitation, so that the automatic control input and cut-off of 10 electric precipitation high-frequency power supplies at one side are realized. Increase the automatic input of a side electric field to five electric fields (A electric precipitation A1-A5 electric field high frequency power supply, A electric precipitation B1-B5 electric field high frequency power supply), a side electric field to five electric fields (B electric precipitation A1-A5 electric field high frequency power supply, B electric precipitation B1-B5 electric field high frequency power supply) and set up 20 total (in picture lower part square frame in figure 3) with the biasing, realize that each electric field carries out secondary current parameter according to the defeated grey condition of electric field and the adjustment of operation mode and sets up alone.
(2) A logic part:
the parameter setting and the control logic of the electric precipitation high-frequency power supply in the existing DCS are kept unchanged, and the automatic control logic of the dust concentration at the electric precipitation outlets of the side A and the side B is increased. The side A and the side B are respectively configured with automatic control logic for the dust concentration at the electric precipitation outlet, and the controlled objects are the dust concentrations at the electric precipitation outlet at the side A and the side B. The logic diagram shown in fig. 4 is a control logic diagram of the secondary current of the electric precipitation a electric field high-frequency power supply after configuration in the actual DCS.
The load level directly affects the smoke concentration, and the fluctuation range of the smoke concentration is different under different loads. In order to enhance the adaptability of automatically adjusting the secondary current of the high-frequency power supply under the variable load working condition, feedforward of the change of the load instruction of the unit to the automatic adjustment calculation of the secondary current is added, and the secondary current instruction output parameter of the closed loop is corrected in real time according to the current load instruction, so that the more accurate closed-loop control of the smoke concentration is realized.
In the automatic control loop, considering the problem of secondary dust emission when the five electric field cathode and anode are shaken, the smoke concentration is judged by the sudden rise logic before the PID input, and when the sudden rise reaches the maximum value, the regulated quantity keeps the smoke concentration value before the sudden rise, so as to avoid the short-time secondary current sudden rise and sudden fall of each electric field high-frequency power supply.
The secondary current instruction of the automatic control loop and the original manual secondary current input instruction are switched after being subjected to rate limitation, when a certain electric field high-frequency power supply is put into automatic control, the instruction output of the PID is received, manual secondary current bias setting can be carried out, and when the electric field high-frequency power supply is not put into automatic control, the secondary current manual setting is carried out through an original operation panel.
Considering different ash conveying loads of the electric fields, the upper and lower limit values of the secondary current of the first electric field of the A side and the B side are automatically controlled to be 200-500 mA (debugging determination), and the upper and lower limit values of the secondary current of the second electric field of the A side and the B side to the fifth electric field are automatically controlled to be 300-1500 mA (debugging determination). And (4) the unit load instruction is sent to the feedforward quantity of the control loop and is determined according to debugging.
The invention realizes the configuration of closed-loop control of the dust concentration at the outlet of the electric dust collector in the DCS. Along with the automation level of a power plant is higher and higher, the electric dust removal high-frequency power supply utilizes an MODBUS communication protocol to realize the communication between an upper computer and the set DCS, the electric dust removal high-frequency power supply is monitored and included in the set DCS, and an operator sets parameters such as secondary voltage and secondary current in the DCS to realize the monitoring of the high-frequency power supply. Load signals, smoke concentration signals and the like in the DCS are collected, the strong configuration function and the friendly visual interface of the DCS are utilized, the smoke concentration at the outlet of the electric dust collector is taken as an adjusting object, and the configuration of closed-loop control logic is realized.

Claims (7)

1. A closed-loop control method for smoke concentration at an electric precipitation outlet, which is realized in DCS, is characterized in that:
keeping the parameter setting and control logic of an electric precipitation high-frequency power supply in the DCS unchanged, and increasing the automatic control logic of the dust concentration of the electric precipitation outlets at the side A and the side B;
the upper computer of the high-frequency power supply of the electric dust collector and the host DCS establish communication through an MODBUS protocol, and load signals and smoke concentration signals in the DCS are directly collected;
the side A and the side B are respectively configured with automatic control logics for the dust concentration at the electric precipitation outlet, and the controlled objects are the dust concentration at the electric precipitation outlet at the side A and the side B; the set value and the measured value of the dust concentration at the outlet of the electric precipitation are calculated by a PID algorithm block, and then secondary current total instructions are output, and the total instructions are linearly processed and then sent to high-frequency power supplies of all electric fields; the secondary current of an electric field on the A side and the B side is automatically controlled to be 200-500 mA at the upper and lower limit values; the upper and lower limit values of the secondary current of the two-electric field to the five-electric field on the A side and the B side are automatically controlled to be 300-1500 mA, and the secondary current of the two-electric field to the five-electric field is set in a mode of gradually increasing.
2. The closed-loop control method for the smoke concentration at the outlet of the electric dust collector realized in the DCS according to the claim 1, which is characterized in that: and adding feedforward of the change of the load instruction of the unit to the automatic regulation and calculation of the secondary current, and correcting the secondary current instruction output parameter of the closed loop in real time according to the current load instruction.
3. The closed-loop control method for the smoke concentration at the outlet of the electric dust collector realized in the DCS as claimed in claim 1, characterized in that: and (4) carrying out smoke concentration sudden-rise logic judgment before PID input, and when sudden-rise to the maximum value occurs, keeping the smoke concentration value before sudden-rise by the regulated quantity.
4. The closed-loop control method for the smoke concentration at the outlet of the electric dust collector realized in the DCS according to the claim 1, which is characterized in that: the secondary current instruction of the automatic control loop and the original manual secondary current input instruction are switched after being subjected to rate limitation, and after a certain electric field high-frequency power supply is put into automatic control, the PID instruction is received and output; when the high-frequency power supply of the electric field is not put into automatic control, the secondary current is manually set through the original operation panel.
5. The closed-loop control method for the smoke concentration at the outlet of the electric dust collector realized in the DCS according to the claim 1, which is characterized in that: the feedforward quantity from the unit load instruction to the control loop is set according to the relation between the high-frequency power supply operation parameters and the smoke emission concentration under the load working conditions of 50%,60%,70%,80%,90% and 100% of the units.
6. The closed-loop control method for the smoke concentration at the outlet of the electric dust collector realized in the DCS according to the claim 1, which is characterized in that: and a judgment logic for keeping a good value after the short-time bad quality of the regulated signal, load change feedforward and manual automatic undisturbed switching are added into the PID closed-loop control logic.
7. The closed-loop control method for the smoke concentration at the outlet of the electric dust collector realized in the DCS as claimed in claim 1, characterized in that: the method comprises the steps of respectively adding automatic control input and removal operation buttons of dust concentration of an A-side electric dust removal outlet and a B-side electric dust removal outlet in a DCS dry-type electric dust removal operation picture, and adding automatic input and offset setting operation panels of an A-side electric field to a five-electric field and an B-side electric field to a five-electric field.
CN202110169062.5A 2021-02-07 2021-02-07 Electric precipitation outlet smoke dust concentration closed-loop control method realized in DCS Active CN112973965B (en)

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CN111974551A (en) * 2020-08-05 2020-11-24 大唐淮南洛河发电厂 System for reducing power consumption of electrostatic dust collector and control method thereof

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